CT Chamaeleontis
Star in the constellation Chamaleon From Wikipedia, the free encyclopedia
CT Chamaeleontis (CT Cha) is a T Tauri star - a primary of the star system in the constellation of Chamaeleon.[8] It has an apparent visual magnitude which varies between 12.31 and 12.43.[2] The star is still accreting material at rate 6×10−10 M☉/year.[7]
CT Chamaeleontis and its companion (faint object on the upper right near the star) Credit: NASA/ESA/CSA JWST; Ya-Lin Wu et al.; processing: Meli_thev | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 11h 04m 09.0989s[1] |
| Declination | −76° 27′ 19.3269″[1] |
| Apparent magnitude (V) | 12.31 to 12.43[2] |
| Characteristics | |
| A | |
| Evolutionary stage | T Tauri star |
| Spectral type | K7 Ve[3] |
| Variable type | INB[2] |
| B | |
| Spectral type | M8–L0[4] |
| Astrometry | |
| Radial velocity (Rv) | 15.13±0.09[5] km/s |
| Proper motion (μ) | RA: −22.209±0.039[1] mas/yr Dec.: −0.175±0.035[1] mas/yr |
| Parallax (π) | 5.2144±0.0211 mas[1] |
| Distance | 625 ± 3 ly (191.8 ± 0.8 pc) |
| Position (relative to CT Chamaeleontis) | |
| Component | B |
| Epoch of observation | 2006–2007 |
| Angular distance | 2.670″ [4] |
| Position angle | 300.7° [4] |
| Projected separation | ~440 AU [4] |
| Details[4][6] | |
| A | |
| Mass | 0.796+0.015 −0.014 M☉ |
| Radius | 2.06±0.05 R☉ |
| Luminosity | 1.41+0.17 −0.16 L☉ |
| Surface gravity (log g) | 4.5+0.7 −1.2 cgs |
| Temperature | 4,402+151 −166 K |
| Age | 2±2[4] Myr |
| B | |
| Mass | 19±5[7] MJup |
| Radius | 2.20+0.81 −0.60 RJup |
| Luminosity | 0.002 L☉ |
| Surface gravity (log g) | 3.5 cgs |
| Temperature | 2,500±100[7] K |
| Age | 2±2[4] Myr |
| Other designations | |
| CT Cha, 2MASS J11040909-7627193, IRAS 11027-7611, NSV 5081, WDS J11042-7627AB | |
| Database references | |
| SIMBAD | data |
| B | |
Cuno Hoffmeister discovered that CT Chamaeleontis is a variable star in 1962.[9] It was given its variable star designation in 1981.[10]
Brown dwarf/Planetary system
In 2006 and 2007, a faint companion was observed 2.7 arcseconds away from CT Chamaeleontis, using the Very Large Telescope at the European Southern Observatory. Since the object shares common proper motion with CT Chamaeleontis, it is believed to be physically close to the star, with a projected separation of approximately 440 astronomical units. It is estimated to have a mass of approximately 17 Jupiter masses and is probably a brown dwarf or a planet.[4] The companion has been either designated as CT Chamaeleontis b[12] or as CT Chamaeleontis B, sometimes erroneously as low-mass star.[13] The companion was proven to be most likely in the brown dwarf mass range in 2015.[7]
References
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